Malicious Office (OOXML) / .DOC — malware analysis report

Static analysis result for SHA-256 7fa5243872307916…

MALICIOUS

Office (OOXML) / .DOC

1.96 MB Created: 2022-02-01 22:50:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2022-06-09
MD5: de6e6a048879a45b911662dbccb2951c SHA-1: e07cc29aa9887c7e6445fe6dd470fb1d7a8a28ae SHA-256: 7fa5243872307916f86956fbb0a088e664471d1f7046b1d2514b01b7b6f781e3
144 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample contains an embedded Equation Editor OLE object that exhibits anomalies consistent with CVE-2018-0798. This vulnerability allows for the execution of arbitrary code when the object is processed. The high entropy and anomalous native stream within the OLE object strongly suggest it contains a malicious payload.

Heuristics 6

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object word/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2006/wordml

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
65b9b04ec3b5a01396871ad5963bbe2b95dfcea0ef1523bc8566b7dda4929608		 ooxml-ole-object OOXML embedded OLE part: word/embeddings/oleObject1.bin 1963520 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.98, consistent with packed or encrypted content.
ooxml_oleobject_00_ole10native_00.bin
7c1284ee9b0b09245c41ebe5b8ee1eebc2a2c5c50aa6c74a9555b332e0f34a74		 ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1945620 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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